I'm looking into making a Camera Control app for Android to control URSA mini Pro's via Bluetooth

The Commands look pretty simple they are the same ones as used over SDI for camera control. Before I code it I wanted to test it. I can pair the ursa mini pro with my phone, but using any bluetooth terminal apps (to send comands to the ursa mini pro and test it works) will not connect every single one of them will say connection failed when connecting to the Ursa mini pro, am I missing something simple?

Hey, I would be glad to help you.I'm an experienced freelance Android developer and I have a Pocket 4K preordered.No URSA or any other device to test with yet.Seeing that Blackmagic only published an iPhone app, I already looked at the commands too.